Sketchbook:

I find the Victoinox Tomo very useful as its compact size and shape fit very nicely in my tiny portable drawing mint tin kit along with my small pencils and markers. I have since moved to a slightly bigger tin so I can include an eraser, a couple of extra markers and pencils as well as a mini fountain pen.

In this video the designer Kazuma Yamaguchi explains the design process and concepts behind the Victorinox Tomo: